If you’re looking for something that records and plays back like the MMT8, take a look at the MidiSizer MidiREX (if you haven’t heard of it).
It’s small looping recorder (only 4 tracks) but you can record multiple MPE style on each of the tracks. Thats to say that every note or event also includes the MIDI channel info. It’s meant to be a recorder so editing is somewhat painful. You can also consolidate tracks to make more room so that the 4 track limitation isn’t so bad. Loop time doesn’t have to be predetermined either (similar to hard record on Pyramid).
You can either DIY or buy it pre-assembled for $200